Brian Dunning's FileMaker Custom Functions

LastDayOfMonth ( theDate )

Returns the date of the last day of the specified month

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Darren Terry   Darren Terry - Show more from this author
Pacific Data Management, Inc.

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  Sample input:
LastDayOfMonth ( Date ( 7 , 5, 2006 ))
  Sample output:

  Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

The last day of the specified month is the "0th" day of the next month. FileMaker performs the math. This function will work for any month (including December), and will handle leap years just fine.



HazMatt   HazMatt, Blaine, MN USA
Oct 20, 2012
I had trouble wrapping my brain around this and had to try this in a test database to see how it actually worked.

A supplied date of 12/15/2000 would evaluate to "13/0/2000", and FileMaker does the math, properly returning "12/31/2000".

Nice, simple function!

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Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

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